CN102667461A - Method and device for measuring deterioration and deterioration degree of lubricating oil - Google Patents
Method and device for measuring deterioration and deterioration degree of lubricating oil Download PDFInfo
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- CN102667461A CN102667461A CN2010800530474A CN201080053047A CN102667461A CN 102667461 A CN102667461 A CN 102667461A CN 2010800530474 A CN2010800530474 A CN 2010800530474A CN 201080053047 A CN201080053047 A CN 201080053047A CN 102667461 A CN102667461 A CN 102667461A
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- deterioration
- lubricating oil
- frequency
- electric capacity
- permittivity
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- 230000006866 deterioration Effects 0.000 title claims abstract description 186
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title abstract description 21
- 238000012986 modification Methods 0.000 claims description 23
- 230000004048 modification Effects 0.000 claims description 23
- 238000003556 assay Methods 0.000 claims description 16
- 239000003921 oil Substances 0.000 description 39
- 239000000463 material Substances 0.000 description 15
- 239000003990 capacitor Substances 0.000 description 9
- 239000010705 motor oil Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000010710 diesel engine oil Substances 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000010525 oxidative degradation reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2888—Lubricating oil characteristics, e.g. deterioration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/30—Oils, i.e. hydrocarbon liquids for lubricating properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
- F01M2011/1413—Indicating devices; Other safety devices for indicating the necessity to change the oil by considering dielectric properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2250/00—Measuring
- F16N2250/30—Dialectricum
Abstract
The present invention relates to a method and apparatus for measuring the degree of deterioration or deterioration of a lubricating oil, the method comprising determining the permittivity or capacitance at two or more different frequencies, one of which is one of the two or more frequencies, and determining the state of deterioration or deterioration of the lubricating oil based on the value of the permittivity or capacitance1) In the range of 1-100 Hz, and another frequency (H)2) Over (H)1) And below 10,000 Hz. The method can simply and accurately measure the deterioration and deterioration degree of the lubricating oil, and can predict the deterioration and deterioration mechanism.
Description
Technical field
The present invention relates to deterioration, the degree of deterioration assay method of lubricating oil; Relate to a kind ofly when measuring the deterioration of lubricating oil, rotten degree specifically, can predict deterioration, degree of deterioration assay method and the determinator thereof of the lubricating oil of deterioration, modification mechanism.
Background technology
The deterioration of lubricating oil, degree of deterioration all have very big influence to performance, permanance and the energy-efficient performance etc. of the machinery that uses this lubricating oil, device etc.In addition, the deterioration of lubricating oil, rate of deterioration have significant difference according to the service condition of lubricating oil.Therefore, need simply and exactly to measure deterioration, the status degenerativus of lubricating oil.
In the past; The deterioration of the lubricating oil of engine wet goods, the mensuration of degree of deterioration are had following method: through the service time with lubricating oil be the method for standard, perhaps measure the proterties (for example kinetic viscosity, insoluble matter, acid number, base number etc.) of lubricating oil and the method for judging according to this mensuration result.Yet these methods can not be simply and are measured deterioration, the degree of deterioration of lubricating oil exactly.
To the problems referred to above, in patent documentation 1 for example, disclose electric resistance sensor has been installed in oil pan, measure the method for life of lubricating oil through the changes in resistance of engine oil.In addition, disclose the pH sensor much is set in oil pan, measure the method for life of lubricating oil according to the variation of the pH value of the variation of the acidity, the basicity that are accompanied by oil.
These methods can often be confirmed the changes in resistance of lubricating oil or the variation of pH, and the moment that can reach value or the situation of regulation at the rate of change of resistance or pH is judged as and arrives tenure of use, considers it is a kind of simple method from this point.
But said resistance can not be measured the deterioration of lubricating oil, the situation of degree of deterioration exactly because of sneaking into the deterioration along with lubricating oil, rotten apolar substance breeze (carbon) change that produces, therefore existing.And, even said pH value representation deterioration, rotten degree, but it can not judge lubricating oil generation deterioration, deterioration reason (deterioration, modification mechanism).Therefore, to the deterioration of lubricating oil, rottenly manage this and have problems on the one hand.
In recent years, measure deterioration, the degree of deterioration of lubricating oil through the impedance of measuring lubricating oil, and find out that breeze sneaks into the influence of generation, these are studied always in propelling.
For example, in non-patent literature 1, be the impedance that the such extensive region of 20Hz～600kHz is measured lubricating oil, and the variation of sneaking into the impedance that breeze causes in gasoline or the diesel oil separately be discussed according to resistance (resistance components) and reactance (capacitive component) in frequency.But its result of study is not clearly illustrated the concentration of breeze in gasoline or the diesel oil and the relation of impedance.
Again; In patent documentation 2, disclose, measured the complex impedance of oil, the real part that it is reciprocal is obtained conductance as resistance components; The imaginary part of the inverse of complex impedance is obtained permittivity as capacitive component, according to the fuel-displaced deterioration of this conductance and permittivity check, rotten device.
Yet these patent documentation 2 described methods are difficult to measure deterioration, degree of deterioration exactly according to the measured value of permittivity, and are difficult to analyze lubricating oil deterioration, modification mechanism (worsening reason).
In addition, the device of non-patent literature 1 or patent documentation 2 disclosed mensuration impedances, it measures complicated circuit, makes device be costliness.
The prior art document
Patent documentation
Patent documentation 1: japanese patent laid-open 10-78402 communique
Patent documentation 2: Japanese Patent Laid is opened the 2009-2693 communique
Non-patent literature
Non-patent literature 1: sensor and actuator, B127 (2007), 613-818
Summary of the invention
The technical matters that invention will solve
Under above-mentioned situation, the object of the present invention is to provide a kind of can be simply and measure the deterioration, metamorphic grade of lubricating oil exactly in, can predict deterioration, degree of deterioration assay method and the determinator thereof of the lubricating oil of this deterioration, modification mechanism.
The method of dealing with problems
Inventor of the present invention repeatedly studies in order to reach said purpose with keen determination; Permittivity and the electric capacity of specific low frequency region of finding lubricating oil is along with by the deterioration of lubricating oil, rotten and the amount polar material that produces changes, and the variation of permittivity or changes in capacitance are relevant with respect to the deterioration of the situation of the variation of the frequency of lubricating oil and lubricating oil, modification mechanism (deterioration, reason goes bad).The present invention is based on this discovery and the invention accomplished.
[1] a kind of deterioration of lubricating oil, degree of deterioration assay method; It obtains two permittivity or electric capacity under the above different frequency; According to the value of this permittivity or electric capacity, judge deterioration, the status degenerativus of said lubricating oil, said two with a frequency (H in the upper frequency
1) in the scope of 1～100Hz, another frequency (H
2) above (H
1) and 10, in the scope below the 000Hz.
[2] like deterioration, the degree of deterioration assay method of the described lubricating oil of scheme [1], said frequency (H
1) in the scope of 5～80Hz, frequency (H
2) above (H
1) and 1, in the scope below the 000Hz.
[3] like scheme [1] perhaps deterioration, the degree of deterioration assay method of [2] described lubricating oil, obtain said frequency (H
1) under permittivity (ε
1) or electric capacity (C
1), and frequency (H
2) under permittivity (ε
2) or electric capacity (C
2), with (ε
1) or (C
1), perhaps (ε
2) or (C
2) the value situation that reaches setting value be judged as lubricating oil deterioration, rotten taken place, and according to the variation of permittivity ratio ((ε with respect to the variation of said frequency
1-ε
2)/(H
2-H
1)) or changes in capacitance with respect to the ratio ((C of the variation of said frequency
1-C
2)/(H
2-H
1)) prediction lubricating oil deterioration, modification mechanism.
[4] a kind of deterioration of lubricating oil, degree of deterioration determinator; Comprise pair of electrodes and electric capacity determination part, the electric capacity mensuration circuit that this electric capacity determination part has the AC power that between this pair of electrodes, applies the alternating voltage in the scope of frequency control below 100Hz and measures the electric capacity between said pair of electrodes.
[5] like deterioration, the degree of deterioration determinator of the described lubricating oil of scheme [4], also comprise permittivity calculating portion, this permittivity calculating portion has the permittivity calculating circuit that calculates permittivity based on the resulting electric capacity of said electric capacity determination part.
[6] like scheme [4] perhaps deterioration, the degree of deterioration determinator of [5] described lubricating oil, said pair of electrodes is interdigital array electrode.
[7] the lubricating oil surveillance of a kind of machinery, device, the deterioration of any described lubricating oil, degree of deterioration determinator in employing scheme [4]～[6].
The effect of invention
The present invention can provide a kind of can be simply and measure the deterioration, metamorphic grade of lubricating oil exactly in, can predict deterioration, the degree of deterioration assay method of the lubricating oil of this deterioration, modification mechanism.
Description of drawings
Fig. 1 is the figure (chart) of relation of capacitive component (electric capacity) and the frequency of expression embodiment employed lubricating oil.
Fig. 2 is the figure (chart) of relation of resistance components and the frequency of expression comparative example employed lubricating oil.
Fig. 3 is the concept map of an example of deterioration, the degree of deterioration determinator (electric capacity determination part and permittivity calculating portion) of expression lubricating oil of the present invention.
Fig. 4 is the deterioration of expression lubricating oil of the present invention, another routine concept map of degree of deterioration determinator (electric capacity determination part and permittivity calculating portion).
Embodiment
Being characterized as of the deterioration of lubricating oil of the present invention, degree of deterioration assay method measured the permittivity or the electric capacity of the lubricating oil under two above different frequencies, judges deterioration, the status degenerativus of lubricating oil according to the value of this permittivity or electric capacity.
When " deterioration of lubricating oil, the judgement of status degenerativus " of the present invention is meant the deterioration of measuring lubricating oil, rotten degree, infer modification mechanism (deterioration, rotten reason).Can predict the life-span of employed lubricating oil through both exactly, carry out suitable lubricating management.
Among the present invention,, measure the permittivity or the electric capacity of the lubricating oil under two above different frequencies as the deterioration of judging above-mentioned lubricating oil, the means of status degenerativus.
Again, above-mentioned " more than two " comprise the situation of " two " and the situation of " more than three ", and it measures the not restriction especially of the upper limit of number.That is, to frequency H
1, H
2H
nUnder capacitor C
1, C
2C
nMeasure, and obtain electric permittivity epsilon based on this
1, ε
2ε
n
By capacitivity or the electric capacity of measuring two lubricating oil under the above different frequency, then can measure variation or the changes in capacitance of capacitivity ratio with respect to the variation of frequency, can predict deterioration, the status degenerativus of lubricating oil as described later.If frequencies different more than three is arranged, then can grasp the variation of variation or the changes in capacitance of permittivity more extensively, reliably with respect to frequency again.
Said frequency H different more than two
1, H
2H
nIn at least one frequency (being generally minimum frequency) (H
1) be preferably in the scope of 1～100Hz.Its frequency (H
1) surpassing 100Hz, therefore the permittivity or the changes in capacitance amount and insufficient that change corresponding to the concentration of the deterioration of lubricating oil, the rotten polar material that generates can not distinguish deterioration, the status degenerativus of judging between the lubricating oil exactly.Therefore, frequency (H
1) be preferably in below the 80Hz, be more preferably below 60Hz.
Relative with it, frequency (H
1) not enough 1Hz, the permittivity of mensuration or the value of electric capacity are unstable, need spended time on the mensuration, and noise is also many, can not obtain the measured value of repeatability, so frequency (H
1) be preferably in more than the 5Hz, be more preferably more than 10Hz.
Again, at least one frequency (H in above-mentioned two above different frequencies
1) be preferably in the scope of 5～80Hz, be more preferably scope at 10～60Hz.
On the other hand, (H
1) in addition other frequency (H
2) more preferably greater than said (H
1), and 10, below the 000Hz.Frequency 10,000Hz surpasses, and the permittivity or the changes in capacitance amount that change corresponding to the concentration of the deterioration of lubricating oil, the rotten polar material that generates are abundant inadequately, therefore can not distinguish deterioration, the status degenerativus of judging between the lubricating oil exactly.(H
2) the preferred less than 10 of the upper limit of frequency, 000Hz is more preferably 1, below the 000Hz, further preferably below 500Hz, especially preferably below 200Hz.
Frequency (H when measuring the permittivity of three above different frequencies
3) ... (H
n) scope to surpass (H
2) and 10, below the 000Hz, be more preferably 1, the scope below the 000Hz gets final product.
Among the present invention, judge deterioration, the status degenerativus of lubricating oil according to the value of the permittivity of two above different frequencies or electric capacity.
For example, be conceived to two, can as as follows, judge with two frequencies in the upper frequency.That is, obtain the frequency (H of frequency in 1～100Hz scope
1) under permittivity (ε
1) or electric capacity (C
1) and frequency 10, the zone below the 000Hz greater than said frequency (H
1) frequency (H
2) under permittivity (ε
2) or electric capacity (C
2), according to (ε
1), (C
1) perhaps (ε
2), (C
2) the variation of value and permittivity with respect to variation the ratio ((ε of frequency
1-ε
2)/(H
2-H
1)) or changes in capacitance with respect to variation the ratio ((C of frequency
1-C
2)/(H
2-H
1)), deterioration, the status degenerativus of judgement lubricating oil.
As stated, the judgement of deterioration, status degenerativus is meant: judge deterioration, rotten degree, and prediction deterioration, modification mechanism (deterioration, rotten reason), but the judgement of deterioration, metamorphic grade is preferred usually according to (ε
1) perhaps (C
1) value carry out.This be because, usually, in the survey frequency under the minimum frequency permittivity or capacitance meter be shown maximal value, according to (ε
1) perhaps (C
1) judge can confirm exactly permittivity or electric capacity through the time change.But, according to circumstances, also can be (ε
2), (Y
2), can also be (ε
2) ... (ε
n) or (C
3) ... (C
n).
So, (ε
1) or (C
1) the value of permittivity, electric capacity big more, it is serious more to be judged as deterioration, metamorphic grade.This be because the value of permittivity or electric capacity corresponding to changing by the amount of the deterioration of lubricating oil, the rotten and polar material that generates and sneak into (mainly be oxidation, hot deterioration and the polar material that generates and sneak into the polar material in the lubricating oil).
According to from said frequencies (H
1) under permittivity (ε
1) or electric capacity (Y
1) value in deterioration, the degree of deterioration (deterioration, metamorphic grade) of the lubricating oil that obtains, the method for life of prediction lubricating oil is: (ε for example
1) or (Y
1) value moment of reaching the setting value that sets in the preliminary experiment be estimated as deterioration, rotten taken place, and the frequency (H of the lubricating oil that uses of extrapolation
1) under permittivity (ε
1) or electric capacity (Y
1) through the time change, the time that arrives said setting value is estimated as the remaining life-span, said setting value can be the setting value that the engine oil before and after the model engine test is measured.
Next, to describing based on the deterioration of the value prediction lubricating oil of permittivity under two above different frequencies or electric capacity, the method for modification mechanism (deterioration, rotten reason).
As based on the deterioration of the value prediction lubricating oil of the permittivity of two above different frequencies or electric capacity, the method for modification mechanism (deterioration, rotten reason), give an example based on judging the deterioration of lubricating oil, the method for status degenerativus with respect to the permittivity of frequency or the ratio of changes in capacitance (size).
Specifically, be conceived to the ratio ((ε of the variation of permittivity for example with respect to the variation of frequency
1-ε
2)/(H
2H
1)) or changes in capacitance with respect to the ratio ((C of the variation of frequency
1-C
2)/(H
2-H
1)).
((ε
1-ε
2)/(H
2-H
1)) or ((C
1-C
2)/(H
2-H
1)) compare under the situation of big a lot (comparing above 200% with normal conditions) with normal conditions; Infer for except the material that is produced by lubricating oil deterioration, the rotten polar material generation oxidative degradation that is produced, also sneaked into polar material (deterioration, status degenerativus I) owing to other reason generation.Such deterioration, modification mechanism are confirmed as and are used in petrolic petrol engine oil.
Relative with it, ((ε
1-ε
2)/(H
2-H
1)) or ((C
1-C
2)/(H
2-H
1)) than normal conditions be not very big (normal conditions 200% in); But under the situation of oil body rising, form and aspect variation; Except the material that is produced by lubricating oil deterioration, the rotten polar material generation oxidative degradation that is produced, also sneaked into other apolar substance or low pole material (deterioration, status degenerativus II) by prediction.The deterioration that such deterioration, modification mechanism cause, rotten be considered to be used in the diesel engine oil in the diesel engine sneaked into breeze.In this case, need seek countermeasure, comprising adjusting in-engine fired state and improving breeze trap setting etc.
Again; Whether big the variation of permittivity or changes in capacitance are set and are got final product through carrying out preliminary experiment with respect to the ratio of the variation of frequency judgment standard, and this preliminary experiment compares for the calculated value to the engine oil before and after the test of different types of model engine.At this moment, in determinator, preferably include viscosity meter, form and aspect meter.
Thus, can judge deterioration, the modification mechanism of lubricating oil.Again, among the present invention,, the characteristic beyond said permittivity or the electric capacity is measured, also can be added these characteristics and judge deterioration, modification mechanism for deterioration, the modification mechanism of judging above-mentioned lubricating oil.
Next, the suitable determinator to mensuration permittivity of the present invention or electric capacity describes.
Fig. 3 is the concept map of an example of deterioration, the degree of deterioration determinator of the deterioration of expression lubricating oil of the present invention, lubricating oil that the degree of deterioration assay method is adopted.
The deterioration of this lubricating oil, degree of deterioration determinator comprise: pair of electrodes 1; With electric capacity determination part 2 with AC power 2a, electric capacity mensuration circuit 2b; This AC power 2a applies alternating voltage between this pair of electrodes; The frequency of this alternating voltage can be controlled at below the 100Hz; This electric capacity is measured circuit 2b and is measured the electric capacity between this pair of electrodes, and this determinator further comprises having the permittivity calculating portion 3 that permittivity is calculated circuit 3a, and this permittivity is calculated circuit 3a and calculated permittivity based on said electric capacity determination part 2 resulting C meters.
Said AC power 2a preferably is controlled at the zone below the 10Hz, is more preferably to be controlled at below the 1Hz.
The assay method of the electric capacity of lubricating oil or the computing method of permittivity are: at first pair of electrodes 1 is immersed in the lubricating oil, the AC power 2a through electric capacity determination part 2 applies purpose frequency H between electrode again
1Alternating voltage, measure circuit 2b by electric capacity and measure interelectrode capacitor C
1Next calculate circuit 3a with capacitor C by permittivity as required
1Convert electric permittivity epsilon into
1Likewise, measure different frequency H
2Under capacitor C
2, calculate electric permittivity epsilon equally
2Again, electric permittivity epsilon and capacitor C have the relation of following (I) formula.
ε=C×d/s…(I)
(in the formula, d representes the distance between the pair of electrodes, the surface area that s representes electrode.)
Mensuration voltage in the mensuration of above-mentioned electric capacity is preferably in 0.1～10V
P-pScope.
The preferably interdigital array electrode of the pair of electrodes 1 of Fig. 3 is more preferably interdigital array microelectrode.As electric capacity determination part 2, permittivity calculating portion 3, can adopt LCR measuring instrument or C measuring instrument again.
So directly measure the capacitor C of lubricating oil, and obtain the method for electric permittivity epsilon according to the value of this capacitor C, its device is simple, therefore can low price, simply and accurately electric capacity, the permittivity of lubricating oil are measured, calculated.
Especially pair of electrodes 1; Use under the situation of interdigital array electrode; Can make extremely miniaturization of evaluating apparatus, only adopt micro-sample oil (lubricating oil) promptly can measure deterioration, the degree of deterioration of lubricating oil, simultaneously; Observe sample oil during mensuration easily, outward appearance (color etc.) or the smell oily from sample also can obtain deterioration, metamorphic grade or the deterioration about lubricating oil, the side information that modification mechanism is relevant.
Fig. 4 representes to be used for the concept map of other instances of deterioration, degree of deterioration determinator of lubricating oil of deterioration, the degree of deterioration assay method of the lubricating oil of embodiment of the present invention.
This determinator is to comprise: pair of electrodes 11, can with frequency control below 1Hz AC power 12, galvanometer 13, voltmeter 14 and have complex impedance counting circuit 15a and the deterioration of the lubricating oil of the electric capacity determination part 15 of electric capacity counting circuit 15b, degree of deterioration determinator, this determinator also can also comprise having the permittivity calculating portion 16 that permittivity is calculated circuit 16a.
The method of measuring, calculate electric capacity or permittivity is following: at first pair of electrodes 11 is immersed in the lubricating oil, through can frequency control being applied frequency H in the AC power below the 1Hz 12 between electrode
1Alternating voltage.Next; Calculate the impedance of lubricating oil by complex impedance counting circuit 15a according to the phase differential of electric current I, voltage V and electric current and the voltage measured by galvanometer, voltmeter; And by electric capacity counting circuit 15b, according to real part (resistance components) Z that constitutes this impedance
RAnd imaginary part (impedance) Z
CIn imaginary part (impedance) Z
CValue calculate capacitive component (being electric capacity) C
1(with reference to following formula (II)).Next calculate circuit 16a according to capacitor C by permittivity as required
1Value obtain electric permittivity epsilon
1Again, likewise, to different frequency H
2Under capacitor C
2Measure.
Z=V/I
=Z
R+Z
C=R+1/jωC…(II)
(in the formula, Z representes impedance, Z
RExpression resistance components, Z
CImaginary part, the R of expression impedance represent that resistance value, j represent that imaginary unit, ω represent that the angular oscillation number, the C that exchange represent electric capacity.)
Mensuration voltage in the mensuration of above-mentioned electric capacity is preferably in the scope of 0.1～10Vp-p.
The part of operation monitoring system that deterioration, the degree of deterioration determinator of the aforesaid lubricating oil that uses during the present invention implements can consist of machinery, the device of engine etc. often keeps watch on deterioration, the status degenerativus of lubricating oil.Therefore, the lubricating oil surveillance that can be used as machinery, device is used.
Embodiment
Further specify embodiments of the invention, but the present invention is defined in these instances.
(embodiment)
Use deterioration, the degree of deterioration determinator (electric capacity determination part and permittivity calculating portion) of lubricating oil shown in Figure 4; According to following condition determination; To following sample oil (i)～(v) (fresh oil and deterioration, rotten oil) measures 40,100,150,1000 and 10, the capacitive component under the 000Hz (electric capacity (pF)).Its result is the variation of the variation of capacitive component (electric capacity) with respect to frequency, and is as shown in Figure 1.
(condition determination)
Electrode: interdigital array microelectrode
Measure voltage 1V
P-p
(mensuration sample)
(i) lubricating oil A fresh oil (ashless engine oil)
(ii) lubricating oil B fresh oil (CD level diesel engine oil)
(iii) lubricating oil A deterioration oil (GE) (be used in petrol engine (GE), and deterioration taken place: sneak into polar material)
(iv) lubricating oil A deterioration oil (DE) (be used for diesel engine (DE), and deterioration taken place: sneak into dust)
(v) lubricating oil B deterioration oil (DE) (be used for diesel engine (DE), and deterioration taken place: sneak into dust)
Again, the capacitive component (electric capacity) under frequency 40Hz and the 100Hz is (C
40) and (C
100) time, the variation of capacitive component is calculated according to following formula with respect to the ratio of the variation of frequency.
The variation of capacitive component (electric capacity) is with respect to the ratio (%) of the variation of frequency
=〔(C
40-C
100)/(100-40)〕×100
Again, likewise, the permittivity of obtaining according to the capacitive component under frequency 40Hz and the 100Hz is ε
40And ε
100The time, the variation of permittivity is calculated according to following formula with respect to the ratio of the variation of frequency.
The variation of permittivity is with respect to the ratio (%) of the variation of frequency
=〔(ε
40-ε
100)/(100-40)〕×100
Here, the variation of capacitive component is as shown in table 1 with respect to the result of the ratio of the variation of said frequency.
[table 1]
Can draw as drawing a conclusion based on Fig. 1 and table 1.
Sample oil (i) is different with sample oil composition (ii), and its capacitive component (electric capacity) is in frequency 40～10, and the scope of 000Hz does not have difference, and is all littler than any one deterioration, the oil that goes bad.
In addition; Even for identical lubricating oil A; For owing to deterioration, rotten has taken place, sneaked into as the sample oil of the polar material of deterioration, rotten product (iii) with owing to deterioration, rotten has taken place at diesel engine at petrol engine; Sneaked into (iv) as the sample oil of the dust outside the polar material of deterioration, rotten product; The variation of the capacitive component (electric capacity) of this two kinds of samples oil is different with respect to the ratio of the variation of frequency, (iii) big of sample oil, (iv) little of sample oil.In addition, show with sample oil lubricating oil B fresh oil (ii) with the (iv) same diesel engine of sample oil in deterioration, the lubricating oil B deterioration of the rotten sample oil (V) that obtains, rotten oil have taken place the variation of capacitive component (electric capacity) with respect to the ratio of the variation of the frequency (iv) the same with sample oil.
Therefore, can be according to the variation of capacitive component (electric capacity) ratio with respect to the variation of frequency, the deterioration of prediction lubricating oil, modification mechanism (deterioration, rotten reason).
In addition, as shown in Figure 1ly know that different according to the variation ratio of the capacitive component (electric capacity) under 40Hz and the plural frequency beyond the 100Hz also can be predicted deterioration, the modification mechanism (deterioration, rotten reason) of lubricating oil.
(comparative example)
To the sample oil that is adopted among the embodiment, the resistance components (Ω) of measuring impedance replaces the capacitive component (electric capacity) among the embodiment.The variation of its result's resistance components is as shown in Figure 2 with respect to the variation of frequency.The sample oil of the frequency of determinator, voltage, mensuration and use is all identical with embodiment.
As shown in Figure 2, (variation of the resistance components of the fresh oil of lubricating oil v) and deterioration, rotten oil can not confirm evident difference with respect to the variation of frequency to sample oil (i)～sample oil.Hence one can see that, can not predict deterioration, the modification mechanism of lubricating oil according to this method.
And, can know according to Fig. 1 of embodiment and Fig. 2 of comparative example:
(1) lubricating oil deterioration, metamorphic grade are showing on the capacitive component (electric capacity) of this lubricating oil measured impedance, not performance on resistance components.
(2) deterioration of lubricating oil, metamorphic grade can show according to the said capacitive component (electric capacity) of low frequency region relatively, the especially said capacitive component (electric capacity) according to the zone of the scope of 1～100Hz clearly.
(3) for the fresh oil of lubricating oil, for different lubricating oil, said capacitive component (electric capacity) does not almost have difference.
(4) being is for identical lubricating oil, and deterioration, rotten condition are different, and the situation of each said capacitive component (electric capacity) (size of electric capacity, perhaps changes in capacitance is with respect to the variation of frequency) is also different.
(5) even identical deterioration, rotten condition, its deterioration of different oils, status degenerativus are also different.
Can know that to sum up the capacitivity through the capacitive component of measuring under the specific frequencies different more than two (electric capacity) is perhaps calculated based on this C meter can be lubricated deterioration, degree of metamorphism and the deterioration of oil, the prediction of modification mechanism.
Utilizability on the industry
According to deterioration, the degree of deterioration assay method of lubricating oil of the present invention, can be simply and measure deterioration, the metamorphic grade of lubricating oil exactly, can predict its deterioration, modification mechanism (worsening reason) simultaneously.Again, even the sample oil of trace, the deterioration of lubricating oil of the present invention, degree of deterioration determinator also can be judged deterioration, status degenerativus, further, can be arranged on the machinery, device of motor car engine etc., and effectively utilization is as the lubricating management system.
Claims (7)
1. the deterioration of a lubricating oil, degree of deterioration assay method; It obtains two permittivity or electric capacity under the above different frequency, according to the value of this permittivity or electric capacity, judges deterioration, the status degenerativus of said lubricating oil; It is characterized in that, said two with a frequency (H in the upper frequency
1) in the scope of 1～100Hz, another frequency (H
2) above (H
1) and 10, in the scope below the 000Hz.
2. the deterioration of lubricating oil as claimed in claim 1, degree of deterioration assay method is characterized in that, said frequency (H
1) in the scope of 5～80Hz, frequency (H
2) above (H
1) and 1, in the scope below the 000Hz.
3. like deterioration, the degree of deterioration assay method of claim 1 or 2 described lubricating oil, it is characterized in that, obtain said frequency (H
1) under permittivity (ε
1) or electric capacity (C
1), and frequency (H
2) under permittivity (ε
2) or electric capacity (C
2), with (ε
1) or (C
1), perhaps (ε
2) or (C
2) the value situation that reaches setting value be judged as lubricating oil deterioration, rotten taken place, and according to the variation of permittivity ratio ((ε with respect to the variation of said frequency
1-ε
2)/(H
2-H
1)) or changes in capacitance with respect to the ratio ((C of the variation of said frequency
1-C
2)/(H
2-H
1)) prediction lubricating oil deterioration, modification mechanism.
4. the deterioration of a lubricating oil, degree of deterioration determinator; It is characterized in that; Comprise pair of electrodes and electric capacity determination part, the electric capacity mensuration circuit that this electric capacity determination part has the AC power that between this pair of electrodes, applies the alternating voltage in the scope of frequency control below 100Hz and measures the electric capacity between said pair of electrodes.
5. the deterioration of lubricating oil as claimed in claim 4, degree of deterioration determinator is characterized in that, also comprise permittivity calculating portion, and this permittivity calculating portion has the permittivity calculating circuit that calculates permittivity based on the resulting electric capacity of said electric capacity determination part.
6. like deterioration, the degree of deterioration determinator of claim 4 or 5 described lubricating oil, it is characterized in that said pair of electrodes is interdigital array electrode.
7. the lubricating oil surveillance of a machinery, device is characterized in that, adopts deterioration, the degree of deterioration determinator of any described lubricating oil in the claim 4～6.
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| JP2009-268119 | 2009-11-25 | ||
| JP2009268119 | 2009-11-25 | ||
| PCT/JP2010/070842 WO2011065340A1 (en) | 2009-11-25 | 2010-11-22 | Measurement method of degradation/alteration degree of lubricant oil and measurement device thereof |
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| CN102667461B CN102667461B (en) | 2016-01-06 |
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| Country | Link |
|---|---|
| US (1) | US8854058B2 (en) |
| EP (1) | EP2505999B1 (en) |
| JP (1) | JP5706830B2 (en) |
| KR (1) | KR101730679B1 (en) |
| CN (1) | CN102667461B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20120229151A1 (en) | 2012-09-13 |
| EP2505999A4 (en) | 2014-06-04 |
| TW201142283A (en) | 2011-12-01 |
| KR20120098732A (en) | 2012-09-05 |
| EP2505999A1 (en) | 2012-10-03 |
| CN102667461B (en) | 2016-01-06 |
| KR101730679B1 (en) | 2017-04-26 |
| EP2505999B1 (en) | 2017-01-04 |
| TWI480551B (en) | 2015-04-11 |
| US8854058B2 (en) | 2014-10-07 |
| JP5706830B2 (en) | 2015-04-22 |
| WO2011065340A1 (en) | 2011-06-03 |
| JPWO2011065340A1 (en) | 2013-04-11 |
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